Good eve Gents! These are the largest outside diameter Grado/Magnum cups I've built. Just over 3" and the finish turned out ridiculous. These are Magnum V4 drivers and pure copper cable with matching Coco cable splitter and my aluminum rodblocks/gimbals. The headband is actually a headphonelounge headband. Really nice quality and a good alternative to the rest of the headbands (including mine) out there.